1) 31+62=3x
93=3x
x=93÷3
x=31
2) 290+310=2a
600=2a
a=600÷2
a=300
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1) 31+62=3x
93=3x
x=93÷3
x=31
2) 290+310=2a
600=2a
a=600÷2
a=300